Bending buckling of an elastoplastic cylindrical shell with a cutout

The buckling behavior of an elastoplastic cylindrical shell with a cutout u nder pure bending was investigated analytically and experimentally. For ana lysis, a finite element code based on an updated Lagrangian formulation was established to analyze the problem of bending buckling by considering nonl inear geometric and material properties. An iterative displacement-controll ed scheme was adopted in the solution procedure to ensure the pure bending state and to avoid numerical instability near the limiting buckling moment. A testing device was used to perform experiments on bending buckling. The ratio of diameter to thickness of the aluminum specimens was 50; the ratio of length to diameter was 7.9. The shape of the cutout on the shell was cir cular or rectangular. The influence of the size and location of the cutout on the limiting buckling moment is discussed. Antisymmetric deformation aro und the cutout in the shells was observed after bending buckling of the she ll. (C) 1999 Elsevier Science Ltd. All rights reserved.